Car-bolster.



No. 805,749. PATENTED NOV. 28,1905. 0. S. PULLIAM.

CAR BOLSTBR. APPLIUATION FILED `JULY 21.1905.

WITNESS E s:

INVENTOR OSWALD S. PULLIAM, OF PITTSBURG, PENNSYLVANIA.

CAR-BOLSTER.

Specication of Letters Patent.

Fate-.ated Nov. 28, 1905.

Application filed July 2l, 1905. Serial No. 270,686.

To all whom, t may concern:

Be it known that I, OsWALD S. PULLIAM, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and Stateof Pennsylvania, have invented' new and useful Improvements in Car-Bolsters, of which the following is a speciiication.

An object of my invention is to provide a new and improved car-bolster combining the element-s of strength, rigidity, and lightness requisite to meet service conditions.

Another object of the present invention is the production of aA car-bolster of such form that it may be employed either as a truckbolster or as a body-bolster.

A further object of my invention is to provide a bolster of the form which may be cast as a complete integral structure or which may be built of separate pieces.

To these ends my invention consists of a new and improved car-bolster, in the novel features of construction, and in the combination and arrangement of parts, all as fully hereinafter described and claimed.

In the accompanying drawings, which illustrate applications of my invention, Figure l is a perspective view of my invention in the form of a car-truck bolster; Fig. 2, a vertical sectional view of the form of Fig. l; Fig. 3, a sectional view showing two channels forming the top and bottom members, and Fig. 4 a sectional view showing the embodiment of my invention in the form of a cast bolster in which the parts are formed from a single casting.

Referring to the drawings, the forms of bolsters illustrated comprise a top or compression member 1, a bottom or tension member 2, and an I-beam iiller 3. As shown in the construction of Fig. 1, the compression member 1 is in the form of a channel and the tension member formed from a bent plate. In the form of Fig. 3 both the compression member and the tension member are formed of channels. In the cast-metal construction shown by Fig. i the compression and tension members correspond in shape with the forms of Fig. l.

While I have shown the preferred forms of compression and tension members, my invention is not limited to these particular shapes for the top and bottom members.

rIhe central bearing-plate 4 and the side bearings 5 5 are of the usual construction and are secured to the compression member in the form of Fig. l by being riveted thereto.

A characteristic and important feature of my invention is the tapering I-beam filler 3. As shown and as preferred, filler 3 is formed oi' a continuous piece of metal and extends throughout the length of the bolster.

It has heretofore been the practice in some forms of car-bolster constructions employing a top compression member and a bottom tension member to connect the said members at various points by independent and separated malleable or cast iron fillers. Such constructions have proven defective in service owing to the buckling of the bolsters between the iiilers caused by the varying compression and tension strains to which the bolsters are subjected. vIn the forms of bolsters illustratedI am enabled to overcome this serious defect by providing constructions in which the compression member, as well as the tension member, are held apart and secured to or formed with a continuous iiller extending throughout the length of the said members. Such a construction, in addition to doing away with the usual malleable or cast iron separated iillers and their accompanying disadvantages, enables me to employ a continuous filler of comparatively light section and to place the weight andstrength in the compression and tension members, where it is most desirable.

Attention is called to the fact that the built-up bolsters shown may be formed of commercial rolled steel shapes and that the cast-metal form is of such shape that the same may be readily cast.

The bolsters illustrated are of greater depth at the center than at the ends, and in order to provide for this construction the I-beam filler is formed with its web of greater depth at the center than at its ends and the tension member bent to correspond to the contour of the lower iianges of the tapering I-beam.

In the built-up form of bolster the I-beam filler may be formed of a continuous piece of cast metal.

What I claim is4 IOO l. A car-bolster consisting of a top com- IIO 3. A car-bolster Consisting of a. straight terposed between said members and eXtend- IO compression member, a bent tension member, ing substantially throughout the length of the and a continuous taperingI-beam Eller interbolster. posed between the compression and tension In testimony whereof I aflix my signature in 5 members and extendingsubstantially throughpresence of two subscribing witnesses.

out the length of the bolster. OSWALD S. PULLIAM.

4. A car-bolster consisting of :L top eom- Witnesses: pression member, a bottom tension member, MARGARET HUGHES,

and a continuous cast-metal I-beam filler ini W. G. DOOLITTLE. 

